extracted a PluginStrategy from PluginManager and PluginWrapper

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@12443 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/PluginStrategy.java

@@ -0,0 +1,34 @@
+package hudson;
+
+import java.io.File;
+import java.io.IOException;
+
+public interface PluginStrategy {
+
+	/**
+	 * Creates a plugin wrapper, which provides a management interface for the plugin
+	 * @param archive
+	 * @return
+	 * @throws IOException
+	 */
+	public abstract PluginWrapper createPluginWrapper(File archive)
+			throws IOException;
+
+	/**
+	 * Loads the plugin and starts it.
+	 * 
+	 * <p>
+	 * This should be done after all the classloaders are constructed for all
+	 * the plugins, so that dependencies can be properly loaded by plugins.
+	 */
+	public abstract void load(PluginWrapper wrapper) throws IOException;
+
+	/**
+	 * Optionally start services provided by the plugin. Should be called
+	 * when all plugins are loaded.
+	 * 
+	 * @param plugin
+	 */
+	public abstract void initializeComponents(PluginWrapper plugin);
+
+}